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Useful solvent in halex fluorinations of chloroarenes; compare Sulfolane, A13466.•
In the presence of triflic anhydride and 2,4,6-collidine, forms a highly-reactive keteniminium triflate, which undergoes a [2+2] cycloaddition reaction with terminal alkenes to give, after hydrolysis a 3-alkylcyclobutanone: J. Am. Chem. Soc., 107, 2192 (1985); Org. Synth. Coll., 8, 306 (1993):

• Reacts with alkyl and aryl Grignard reagents to give methyl ketones in good yields: Synthesis, 228 (1984).
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See also Sodium hydride, 13431, for warning.• Undergoes Vilsmeier-type reactions (compare DMF), with reactive substrates, introducing an acetyl group: Chem. Ber., 97, 616 (1964).